Multiple wall container and method of construction



'July 23, 1957 A. A. ONDREJKA I 2,

MULTIPLE WALL CONTAINER AND METHOD 0? CONSTRUCTION Filed Nov. 26, 1954 Ti y/ /4 INVENTOR. ALBERT A. ONDREJKA nib B.

Unu-

' teale243 l MULTIPLE WALL CONTAINER AND METHOD CQNSTRUCTION Albert A. Ondrejka, Rome, N Y.;, assignor to the United States of Americans represented by the Secretary of the Air Force Application November 26, 1954, Serial No; 471,546

7 3 Claims. (Cram-15 (Granted under Title 35, U. S. Code (1952), see. 266) The invention describedv herein may be manufactured and used by or for the United States Government for governmental purposesv without payment to me of any royalty thereon.

The invention relates to ashock-resistant rigidlightweight container adapted to transport or carry transits, electronic equipment, radar equipmentand similar delicate, equipment, and. to a method of making this container wherein a central .plastic core is cast in the space between two shells to form an'gid container. I

,It is an object of this invention to provide a lightweight rigid container which is resistant to shock for transporting or carrying delicate equipment.

Another object ofthis invention is to provide an easy and relatively low cost method of manufacturing a shock- 2,800,243 Patented July, 23, 1957 Rim 17 is headmaster shell and inner shell 16 by Welding or other sllitable-means, depending upon the material which: the rim? and the shells are made. That is,j welding would :be suitable for bondingthe rim to the lnner and outer shellsif they were made of steel. .An

.adhesive would be required to bond the inner and outer shellsto the rim ifthey-were made of plastic. Aluminum alloys, magnesium "alloys and certain other metals and .alloys may also be suitable for the rim and shells. The

purpose of bonding the I'lIIlziOlhB shells is to insure leakproof sealsbetween he rim andtheshell's and tosupport and position inner shell lfi yvithinouter shell 14, providing an air spacejbetweengthe, shells.-;A resilient inner liner is attached to the inner surface of inner-shell 16 by a metal support-or';other. suitable means. This resilient inner lineri'spreferably made of sponge rubber or the equivalentthereof. Ifa steel support is used to attach resilientinner liner 20 to an inner steel shell, welding or riveting are suitablemethods of attachment.

The next step in-themanufacture of my container is topour a liquidivplastic'through openings 19 into the space between shells 14 and 16 displacing the air therefrom. Plastics'whichi.al-e particularly suitable for my invention are foam-inj-place plastics. Some examples of suitable, foam-in-place plastics are: alkyd-'diisocy-anates which.aremanufactured by: the Goodyear 'Aircraft Co.; Armfoam, -;Armour,& Company; Nopco Lockfoam,

resistant rigid lightweight container for delicate equipment.

Still another object ofthis invention is to prov-ide any desirable degreeof protection in-a shock-resistant container by varyingthe plastic-used in the core and/or the thickness of the core i A further objectof thisinvention is to provide shockresistant containers that. may be manufacturetl bysmall shops.

An additional object of my invention is to provide shock-resistant rigid lightweight leak-resistant containers and a method for manufacturing them. p

A particular object of my invention is to provide a shock-resistant rigid lightweight leak-resistant container having a body and separable top which may be made by positioning by a rim an inner shell within an outer shell which may have undulations therein, casting a plastic in the space between shells, the body and cover rims containing gaskets and being shaped and positioned to mate in a male-female relationship, and attaching to the container certain other auxiliary equipment as desired such as carrying handles, separable fastening meansffeinforcing edging on the rectangular containers, sponge rubber inner liners, etc.

A detailed discussion of a preferred embodiment of my invention will be made in conjunction with the attached drawings.

Fig. 1 is an elevational view partially in section of my improved container.

Fig. 2 is enlarged sectional elevation views showing the cover and body rims.

Fig. 3 is an enlarged sectional elevation View showing the cover and body rims mated gasket to gasket.

Container 11 is composed of two main parts which are body 12 and cover 13. Body 12 has an outer shell 14 having horizontal undulations 15 therein and an inner shell 16. These shells may be formed by conventional techniques depending on their composition. The inner shell is positioned within the outer shell by rim 17. Rim 17 is formed in the shape of a female element having groove 18 in one side thereof and spaced openings 19 communicating groove 18 with the other side of the rim.

Nopco Chemical Go.,;-Ha'1-r-ison, J.; Stypol 101-1.5E, Robertson Co.,;Pittsburgh;fPa andphenolic and nylon-modified butadiene-acrylonitriles, Hamilton-Standard Div. of United Aircraft ,Corp., Hartford, Conn. Dependinguponthe particular plastic which is. used, a;catalyst may be required rtoycausethe plastic to cure and solidifywithincareasonable time and elevated temperatures-of theordenofiabout 200F. to 300 vF. may be required, and in such case the container having-the liquid plastic therein isz putxin a 'furna'ce' where the plastic cures and solidifies formingarigid container. f

Now gasket '22*is:bondediwithinjtgroove 18 closing open ings 19 thereinz; The gasket. isrpreferably made :of new prene rubberrhaving a hardnessrof about 60 to 70 idurometer at room .temperature; Another suitable gasket ma-v terial is ayrubber-corkicomposition havingi comparable hardness. The gasket may be bonded within the groove by a suitable adhesive, and the purpose of bonding the gasket within the groove is to completely seal-in the core of the container so no leakage into the core may occur. A further purpose of the gasket 22 is to provide a leakresistant seal when gasket 22 is mated with gasket 31. Cover 13 of container 11 is manufactured in a method similar to that used in manufacturing body 12. Cover -13 is composed of outer shell 23 having undulation 24 therein, inner shell 25, rim 26 and plastic 30. Materials used in the cover are preferably the same as those used in the body. Rim 26 is fashioned in the form of a male element which has a groove 27 and spaced openings 28 communicating the groove with the other side of the rim. In a like manner to rim 17 of the body, rim 26 is bonded to the inner and outer shells of the cover. Spaced openings 28 in the cover rim allow liquid plastic to be poured between the cover shells. After plastic 30 is cured and solidified it is sealed in by a plug-like gasket 31 which is bonded in groove 27, filling this groove and extending outside it.

Container 11 is rectangular in shape and its edges and corners are reinforced by extra-heavy strips of material 33 on the body and 34 on the cover. This, reinforcing material is preferably made of the same material that is used in the inner and outer shells of the body and cover. The reinforcing material may be attached to the body and cover by welding or other suitable means depending upon the material used. Separable fastening means 32/ are attached to cover 13 and body 12 to allow the cover to be securely and tightly clamped to the body providing a leak-resistant container. Carrying handles 35 are ateasy hand-carrying of the contain en I Although the invention has" been described in terms of a specific embodiment whichis set forth in considertached to the outside she ll of the body to provide for,

able detail, it should be understood that this is by way of illustration only and that the invention is not necessarily limited thereto, since alternative" embodiments will become apparent to those skilledin the art in view of the communicating the groove with the other side of said rim, said innershell being joined with. and positioned within said outer shell by said'rim'which is bonded to both shells to form leak-proof seals, a solid plastic filling the space between said shells, and a gasket positioned in said groove and closing the openings therein; and said cover comprising a cover outer shell, a cover inner shell,

a cover rim having a groove in the lower and outer side thereof and spaced openings communicating the groove with the other side of the rim, the cover inner shell being joined with and positioned within the cover outer shell by the cover rim which is bonded to both shells to form leak-proof seals, a plastic filling the space between said cover shells, a gasket in the cover rim groove .closing the openings therein, and said rim and cover rim being so Accordi shaped and positioned that they fit together gasket to gasket in a male-female relationshipwhen'said cover is on said body. v

2. A shock-resistant rigid lightweight leak-resistant container particularly designed for carrying and transporting sensitive instruments and having a body and a separable cover, said body comprising an outer shell having undulations therein, an inner shell, a rim having a groove in the upper and outer'side' thereof and spaced openings communicating said groove with'the other side of said rim, said inner shell being joined with and positioned within said outer shell by said rim which is bonded to both shells to form leak-proof seals, a resilient inner liner attached to said inner shell, a solid plastic filling the space between said shells, and a gasket positioned in and bonded to said groove closing the openings therein; and said cover comprising a cover outer shell having undulations therein, a cover inner shell, a cover rim having a groove in the lower and outer side thereof and spaced openings communicating the groove with the other side of the rim, said cover inner shell being joined with and positioned within said cover outer shell by said cover rim which is bonded to both shells to form leak-proof seals, a resilient inner liner attached to said cover inner shell, a solid plastic filling the space between said cover shells, a gasket positioned in and bonded to the cover rim groove closing the openings therein, said rim and cover rim being so shaped and positioned that they fit together gasket to gasket in a male-female relationship when said cover is on said body, and separable fastening means attached to said cover and said body, said fastening means being capable of securely fastening said cover to said body to give a leak-resistant container. 7

' 3. The container of claim 2 wherein said container is rectangular in shape, the outer edges and corners of said container are reinforced byextra-heavy strips of mate- 'rial attached thereto, said undulations are horizontal v undulations, carrying handle means are attached to the outer shell of the body of said. container, .said resilient liners are sponge rubber, said gaskets are hard neoprene rubber, and said plastic is, foam-in-place plastic.

References Cited in the file of this patent UNITED STATES PATENTS 1,504,353 Kilus et a1, Aug. 12, 1924 1,651,655 Wright et a1. Dec. 6, 1927 2,147,886 Devine Feb. 21, 1939 2,318,744 Brown May 11, 1943 2,546,166 Pfefferkorn Mar. 27, 1951 2,552,641 Morrison May 15, 1951 2,639,252 Simon et al. May 19, 1953 FOREIGN PATENTS 555,050 France Mar. 15, 1923 France May 1, 1934 

